Home Postcodes by state WA 6078 Postcode 6078 6078 is the postcode for 2 localities in WA: Mariginiup and Pinjar. Localities with postcode 6078MariginiupWAPinjarWA Postcode 6078 State or territory Western Australia (WA) Localities 2 Council area Wanneroo Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6077 · Postcode 6079